JPS5987219A - Oil feed device for hydraulic tappet - Google Patents

Abstract

PURPOSE:To feed the working oil smoothly to an oil hydraulic tappet by forming a de-babbling chamber to separate bubbles from the working oil on a cylinder head cover and forming an air vent in the air suction valve direction from the upper portion of the de-bubbling chamber. CONSTITUTION:The oil fed by pressure from an oil pump is fed to an oil inflow passage 100, is communicated to a communication passage 103 formed at a relatively upper position in a cylinder head cover 43 through an ascending oil passage 101 and a working oil passage 102, is stored in an oil chamber 46 through de-bubbling chambers 104, 104 with the left and right ends communicated, and is fed to the oil feed hole 45 of an oil hydraulic tappet 80. The de-bubbling chambers 104 are provided to weaken the flow speed of the passing oil and float and separate bubbles mixed in it, and are constituted to extract bubbles in the air suction valve direction by means of air vents 105, 105.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil supply device for a hydraulic tappet. A valve train comprising a hydraulic tappet connected to rocker 1M+, which is supported by the eccentric shaft, rotates the eccentric shaft in a direction to eliminate the valve head clearance when the valve is closed, and prevents rotation of the eccentric shaft when the valve is closed. A valve head gap elimination device in the mechanism was proposed.

According to this device, the hydraulic tappet is not given reciprocating motion, has good responsiveness, and even when the engine is running at high speeds, the valve head gap is reliably eliminated and the valve mechanism operates quietly and properly. can. Further, the hydraulic tappet can be installed anywhere as long as it is related to the rocker shaft, so regardless of the type of engine, there is a high degree of freedom in installing the tappet, which is extremely advantageous in terms of layout.

The present invention has been made for the purpose of smoothly supplying hydraulic oil to the hydraulic tappets constituting such a device.

In order to achieve such an object, the present invention forms a defoaming chamber in the cylinder head cover for separating air bubbles from the hydraulic oil, and also forms an air vent hole from the upper part of the defoaming chamber toward the intake valve. The summary is what was done.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Fig. 1 is a side view of an engine to which a hydraulic tappet oil supply device according to the present invention is applied, and a motorcycle equipped with the engine, and Fig. 2 is an enlarged side view showing a partially cutaway view of the engine. .

A helmet tube 3 is provided at the front end of a frame 2 of the motorcycle 1, a front fork 5 that supports a front wheel 4 is supported on the head tube 3 in a freely steerable manner, and an O frame is provided with a handle 7 on a top bridge 6. Reference numeral 2 denotes a main pipe 21 extending rearward from the rear upper part of the head tube 3, a down tube 22 hanging downward from the rear lower part of the head tube 3, and a down tube lower extending rearward from the lower end of the down tube 22. 22a1 The down tube blower 22a is inclined from the rear end of the down tube blower 22a to the front in three directions, and consists of a center tube 24 joined to the rear end of the main pipe 21, a seal L-rail 25 extending rearward of the main pipe 21, and the like.

Down tube lower 22 after the down tube 22
a. The center tube 24 etc. and the main pipe 21 are provided on the left and right, and the main pipe 2 of the frame 2 described above is
A fuel tank 8 is mounted across the rear fork 9 and extends rearward from the lower part of the center tube 24, supporting the rear wheel 10 via a fork 9, and between the middle part of the rear fork 9 and the seat rail 25. A suspension unit 11 is interposed therebetween.

The main pipe 21, down tube 22, and down tube lower 22a of the frame 2 are equipped with an engine 30 in the space made by the center tube 24. Shows the engine.

That is, the upper part of the crankcase 31 of the engine 30 is configured with a front cylinder 4o that stands inclined forward and a rear cylinder 50 that stands inclined rearward, and a V-shaped bank formed between the front and rear cylinders 40 and 50 when viewed from the side. A carburetor 6o is disposed within the space S, and the discharge side of the carburetor 60 is connected to the intake ports of the front and rear cylinders 40 and 50 by connecting vibros 1.62, respectively.

An oil pump (not shown) is disposed at the bottom of the crankcase 31, and the oil supply pipe 33 (d) is connected to the discharge side of the oil pump, and the upper part of the rear wall of the front cylinder 40 forming the ■-shaped bank space S is connected to the discharge side of the oil pump. Oil supply pipes 3 are connected to the upper part of the front wall of the rear cylinder 50 via branch pipes 34 and 35, respectively.
The downstream side of 3 is connected. By the way, the water pump 3 is located on the lower left side of the crankcase 31 as shown in Figure 2.
2 is placed.

Next, the oil supply device according to the present invention will be described together with the configuration of the hydraulic tappet. 3 to 6 show the front cylinder 40
In this figure, the rear cylinder 50 also has a point-to-rib configuration, so the following explanation will be based on the front cylinder 40 in detail.

The cylinder 40 is of a three-valve type with two intake valves at the rear and one exhaust valve at the front (none of which are shown), and is connected to a seven-cylinder head 41 at the top of the cylinder head 41. Thirteen valve cams 71 are formed on the valve camshaft 70, which is horizontally supported so as to be rotatable in the left-right direction at the center of the joint with the cylinder head cover 42. The valve drive camshaft 70 is rotated and driven by the chain brocket mechanism 37 installed between the rocker arm 72 and the crankshaft 36. A rocker shaft 73 is rotatably supported by the cylinder head cover 42 at the upper and rear upper portions, and a rocker arm 72 for an exhaust valve is pivoted at the center on an eccentric shaft 74 formed eccentrically to the front rocker shaft 73 by a certain amount. The rear rocker shafts 73.73 are movably supported, and the rocker arms 72.72 for the intake valves are centrally mounted on eccentric shafts 74.74 formed eccentrically to the respective rear rocker shafts 73.73 by a certain amount. Rocker arms 72 for each intake valve are supported on the left and right rear sides, sandwiching a rocker arm 72 for the exhaust valve at the front.
．． 72 are arranged. These rocker arms 72...
The tips of the pulp stems 79 are pressed from above against the heads of predetermined valve stems 79, respectively, and the pulp stems 79, each of which has a valve at the bottom, are moved upward by return springs (not shown). energized.

Hydraulic tappets 80 are connected to the rocker shafts 73 and 73, respectively. Since the configuration of the hydraulic tappet 80 and the connection configuration with the rocker shaft 73 are the same, the front rocker shaft 73
Only those will be explained and the others will be omitted.

A large diameter shaft 75 and a small diameter shaft 76 are formed at the end of the rocker shaft 74, and a large notch 77 and a small notch 78 are formed on the outer periphery of the large diameter shaft 75, and are opposed to each other with the center of rotation in between.
A hydraulic tappet 80 is connected to 7 from below, and a press rod 92 is connected to small notch 78 from above.

The hydraulic tappet 80 includes a cylinder 81 and a plunger 83 that slides on the inner circumference of the cylinder 81 and defines a hydraulic chamber 82 therein.
The 7-cylinder 81 is fitted into a support hole 44 which is provided vertically over the cylinder head 41 and the cylinder rad cover 42 that constitute the engine body, and the grunge 83 has a spherical end 84 at the upper end thereof. One thread is attached to the ceiling wall of the major notch 77, and the contact point is the rocker shaft 73.
spaced a certain amount from the center of The plunger 83 is formed with an oil reservoir chamber 85 and a valve hole 86 that communicates the oil reservoir chamber 85 with the hydraulic chamber 82 through an oil hole 87 on the side wall of the plunger 83 and an oil hole 88 on the side wall of the cylinder 81. Oil sump room 8
5 communicates with an oil supply hole 45 formed in the side wall of the support hole 44 of the cylinder head <-42.

The oil supply hole 45 communicates with a recess 46a in the center of an oil chamber 46 formed in a cylinder head cuckoo 43 that is joined to the upper part of the cylinder head canopy 42, and oil is sent from this oil supply hole 45. The oil reservoir chamber 85 is always filled with oil. In addition, the oil supply hole 45 includes, in detail, an oil supply hole 45a toward the exhaust valve and an oil supply hole 45b toward the intake valve.
There are two types. Since the engine 30 is of a horizontal V type, the oil supply hole 45a on the exhaust valve side is replaced by the oil supply hole 45b on the intake valve side.
Located further down. Therefore, the diameter of the lower oil supply hole 45a is made smaller than the diameter of the upper oil supply hole 451b to evenly distribute the oil supply.

Furthermore, a nozzle-shaped nozzle cage 89 is fitted to the lower end of the plunger 83, and within the nozzle cage 89 is a spherical check nozzle 90 that opens and closes the valve hole 86, and a spherical check nozzle 90 that is biased in the valve opening direction. A valve spring (not shown) is housed therein. Further, an extrusion spring 91 that urges the plunger 83 upwardly from the cylinder 81 is installed in the hydraulic chamber 82 .

On the other hand, the pressing rod 92 is connected to the cylinder head cover 42 and the support hole 47 vertically provided between the cylinder head cover 43 and the cylinder head cover 43.
The lower end thereof is brought into contact with the bottom wall of the small notch 78, and the contact point is spaced apart from the center of the date shaft 73 by a certain amount. This pressing rod 92 is subdivided downward by an auxiliary spring 92 compressed within the support hole 47.

Note that the rocker shaft 73 supported by the cylinder head cover 42
The plunger 83 has a large notch 7 so as to restrict the axial movement of the plunger 83.
It engages with the left and right sides of 7.

The oil pumped from the oil pump 32 is fed from the rear wall of the cylinder head cover 42 to the cylinder through the oil supply pipe 33 and the branch pipe 34 to the oil inflow path 100 in the rad cover 42, and this oil inflow path 100
The second oil passage 101 in the rad cover 42 to the cylinder,
Cover 43 of the cylinder head cover and cover 42 of the cylinder head cover.
A communication passage 103 in the cover 43 of the cylinder head cover, which will be described later, is connected to the hydraulic oil passage 102 formed in the dividing surface of the cylinder head cover.
is connected to.

The hydraulic oil passage 102 is further connected to the cover 4 of the cylinder head cover.
The left and right ends of the communication path 103 extend in the front-rear direction along the left and right 'dl11 walls in the cover 43 of the cylinder head cover, respectively. It communicates with the formed defoaming chamber 104.104. After passing through these defoaming chambers 104 and 104, the oil is stored in the oil chamber 46, and is fed from this oil chamber 46 to the oil supply hole 45. Similarly, the defoamed oil in the oil chamber 46 is transferred to the rocker shaft 73. The oil is supplied to the bearing hole 112 of the rocker arm 72 through the shaft hole 110 and the horizontal hole 111 formed in the small diameter shaft 76, and then flows out from the oil hole (not shown) formed in the rocker arm 72 to the peripheral surface of the valve operating cam 71. be sent.

Here, in Fig. 6, the left and right double-ended hook shafts are 73°73
The small diameter shafts 76, 76 of the two small diameter shafts 76.
A distribution chamber 116 is formed at a certain interval between the opposing surfaces of the oil chambers 76 , and a degassed oil chamber 46 is provided in the distribution chamber 116 .
The oil inside is supplied through an oil passage (not shown), and as described above, the +iql+ hole 110 of each rocker shaft 73, 73,
110 and slots 111, 111, respectively, and the double-ended hook arm γ2. The oil holes (
(not shown) and is fed to the circumferential surface of the valve operating cam 71, where it is distributed and supplied to lubricate each part.

By the way, the defoaming chamber 104 weakens the flow velocity of the oil passing through the chamber and floats the air bubbles mixed therein to separate them, and is formed at the rear of the opposing inner walls of the left and right defoaming chambers 104. In other words, since the engine 30 is a horizontal V-shaped engine, the air vent holes 105, 105 are configured to vent air bubbles toward the intake valve. An air vent hole 105 is formed in a position higher than the air vent hole 103, and the air vent hole 105 is opened at an angle toward the intake valve.
It is configured to efficiently bleed air during intake of zero air.

Note that the air vent hole 105 has a smaller diameter than the communication hole 103.
Further, the communication hole 103 is formed to have a diameter that is large enough to allow the air bubbles to rise even if they are mixed into the oil.

Incidentally, in the drawings, parts having the same configuration as those described above are indicated using the same reference numerals for convenience.

To explain the action of the hydraulic tappet 80, first, when the valve is closed, the rocker shaft 73 is rotated in a fixed direction by the force couple received from the extrusion spring 91 and the auxiliary spring 93 via the plunger 83 and the pressing rod 92. Because it is dynamically biased,
The rocker arm 72 is pushed toward the valve drive cam 71 and the valve stem 79 via the eccentric shaft 74, thereby increasing the valve head clearance, that is, the respective connecting portions between the rocker arm 72 and the valve drive cam 71 and between the rocker arm 72 and the valve stem 79. Gaps are eliminated.

At this time, if the pressure in the hydraulic chamber 82 is reduced due to the pushing action of the pushing spring 91 against the pusher 83, the check valve 90 opens, so that the oil in the oil reservoir chamber 85 is replenished into the hydraulic chamber 82 through the valve hole 86, and the hydraulic chamber 82 is replenished. 82 is reliably filled with oil.

Next, due to the lift action of the valve operating cam 71, the rocker arm 72
When a valve opening force acts on the eccentric shaft 74, the valve opening force acts on the eccentric shaft 74 as a couple in the opposite direction to that described above, and this couple presses the shiblunger 83 toward the hydraulic chamber 82, but the check valve 90 In order to keep the valve closed, hydraulic pressure is generated in the hydraulic chamber 82, and this hydraulic pressure prevents the sliding plunger 83 from sliding and also prevents the eccentric shaft 74 and the rocker shaft 73 from rotating. As a result, the rocker arm 72 swings about the eccentric shaft 74 and opens the valve against the force of the return spring. During this time, hydraulic chamber 8
A small amount of oil leaks between the sliding surfaces of the cylinder 81 and the plunger 83, but the leaked amount is replenished from the oil reservoir chamber 85 when the valve is next closed.

In the present invention, a degassing chamber 104 is formed in the cover 43 of the rad cover for the cylinder, and an air bleed hole 105 is formed from the second position of the degassing chamber 104 toward the intake valve. As a result, the air separated in the defoaming chamber 104 can be efficiently removed from the defoaming chamber 104 by using the intake air sucked into the intake port 48. As a result, the pressure within can be made constant, and thus hydraulic oil can be smoothly supplied to the hydraulic tappet 80.

The valve stem 79 is formed by rolling as is known in the art.
Since the high frequency valve is welded and connected, the length may vary and may exceed the adjustment range of the hydraulic tappet 80, for example. Therefore, after laying the sheet plate 99 on the bottom of the hydraulic tappet 80, the initial setting of each component groove of the valve head gap eliminating device is performed and adjusted to be appropriate.

Also, an ACG cover 36 is attached to one side of the crankcase 31, and the ACG cover 36 is attached to the side of the horizontal V-type engine 30.
The ACG cover 36 and starter motor cover 37 are integrated with the starter motor cover 37 disposed at the rear of the unit, and the ACG cover 36 and the starter motor cover 37 are integrated with each other. As is clear from FIG. 7, a recess is formed. A hydraulic clutch 117) 71J holder 120 is attached to this recess as shown in FIG.

The cylinder 120 of the hydraulic clutch is integrally molded with ACG.
and bolt connection 3 to the covers 36 and 37 of the nuta motor.
9..., and an air passage 121 is formed between the transmission case 38 and the transmission case 38), and the air passage 121 is opened to the outside air through a hole 122. The tough flush rod 1 is connected to the piston 123 in the cylinder 120 of this hydraulic clutch.
24 is supported by the transmission case 38 via an oil seal 125, and the oil 7-rule 125 receives lubrication (+111 The inner periphery of the oil guide plate 126 is corrugated as described above, and also supports the bushing rod 124 when the cylinder 120 is disconnected, for example.

In Fig. 2, 128 is a hydraulic pipe connected to the rear of the cylinder 120 of the hydraulic clutch, and 129 is an air bleed part facing above the cylinder 120, which facilitates shear bleed adjustment. It is now possible to do this.

There is a metal plate on the outer surface of the oil seal 125).
127 is pressed and attached. That is, the cylinder 120 is assembled as described above while pressing the metal plate 127 formed by cutting out a portion of the outer circumference from the inner end circumferential surface of the cylinder 120 of the hydraulic clutch, and thereby the metal plate 127 is attached to the outer surface of the oil sol 125. The inside of the cylinder 120 and the oil seal 125 are separated from each other. Since this metal plate 127 is installed, the vegetable oil that is the working oil in the cylinder 120 of the hydraulic clutch is reliably separated from the mineral oil in the oil seal 125 on the transmission case 38 side.

As is clear from the above explanation, according to the present invention, a defoaming chamber for separating air bubbles from the hydraulic oil of the hydraulic tappet in a type engine, etc. is formed in the cylinder head cover, and the intake valve is opened from the upper part of the defoaming chamber. Since the air bleed hole is formed facing in the direction, the valve drive system can be lubricated with the lubricating oil blown out from the air bleed hole, and the air in the degassing chamber of the engine can be efficiently bleed, reducing the pressure inside the degassing chamber. It is possible to provide an oil supply device for a hydraulic tappet that can achieve a constant value of 1, and therefore can always smoothly supply hydraulic oil to the hydraulic tappet.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a motorcycle equipped with an engine to which the hydraulic tappet oil supply device according to the present invention is applied, and FIG. FIG. 3 is a cutaway plan view of the main part taken in the three directions of arrows in FIG. 2, and FIGS. -5 line and 6-6 line, and FIG. 7 is a 7-7 line sectional view in FIG. In the drawing, 30 is an engine, 43 is a cylinder head cover member, 130 is a hydraulic tappet, 104 is a defoaming chamber, 105
is an air vent hole. Procedural amendment (spontaneous) 17th April 1980 1) Commissioner Wakasugi, 11th husband, 1, Indication of case: Japanese Patent Application No. 198465 1987 2, Title of invention: Hydraulic tappet oil supply device 3 , Relationship with the case of the person making the amendment Patent applicant (532) Honda Motor Co., Ltd. 4, Agent

Claims (1)

[Claims] A defoaming chamber is formed in a cylinder head cover member above the intake and exhaust valves to separate air bubbles from the hydraulic oil supplied to the hydraulic tappet provided for eliminating gaps between the intake and exhaust valves of the engine, and the defoaming chamber A hydraulic tappet oil supply device 0 characterized in that an air bleed hole is formed from an upper portion toward an intake valve.